Spark plug



Aug. 21, 1923 l,465,869

F. SAMLAND ET AL SPARK PLUG Filed March 27. 1922 Frank who? George filfow INVENTORS WKTNESS: ATTORNEY Patented Aug. 21, 1923.

' u 'ras iaeasae A'reittia V FRANK SAMLAND AND GEORGE SKOVJ, OMAHA, NEBRASKA.

SPARK PLUG.

Application filed March 27, 1922. eel-mine. 547,013.

To aZZw/wmit may concern Be it known that we, FRANK SAMLAND and This invention relates to igniters for in-.

ternal combustion engines, particularly to spark plugs, and has for its object the pro vision of a novel spark plug which has its ground terminal of peculiar formation whereby the spark will occur within the iii-- terior of a firing block, the protecting of the spark in this way preventing the fouling of the point inasmuch as the points are protected from oil at all times.

An important object is the provision of a.

spark plug of this character which is provided at its ground terminal with a firing plug formed with a plurality of intersecting holes through which extends the terminal electrodewhich is across the lower end of the body of the plug.

An additional object is the provision of a plug of this character which will be simple and inexpensive in manufacture, which has great strength and durability and will consequently withstand hard usage, which will be positive in action, durable in service and a general improvement in the art.

'VVith the above and other objects and advantages in view, the invention consists in r the details of construction to be hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of a plug constructed in accordance with our invention.

Figure 2 is a longitudinal sectional view therethrough, and

Figure 3 is a horizontal sectional View taken through the firing block.

Referring more particularly to the drawings, the numeral 10 designates the body of the plug which has its upper portion formed angular as shown for engagement by a suitable wrench and which has its lower portion reduced and externally threaded as indicated at 11 whereby to be engaged within the spark plug or hole of an engine. The lower portion of this body member is formed with a bore 12 while the upper portion is chambered and internally threaded as indicated at 13, this chambered portion being of greaterdiameter than the bore 12 whereby to provide a shoulder 15.

Located within the body is a porcelain core 16 which is formed with an enlarged portion 17 which engages upon the shoulder 15, a suitable packing gasket18 being provided between these parts-' This enlarged portion of the porcelain core defines a shoulder 19 upon which is seated a suitable packing gasket 20 which is engaged by the lowerend of the packing nut 21which is screwed into the chambered out portion 13. and which has an angular upper portion 22 whereby it may be easily engaged by a suitable wrench.

The core 16 is of course provided with the usual longitudinally extending hole 23 through which passes the central electrode 24L which is provided near its lower portion with an enlarged head 25 which fits within a recess '26 formedin the. lower end of the core, this recess defining an abutment'shoulder for the head 25. Disposed against the upper end of the core and of course disposed upon the central electrode 24 is a suitable washer 26 upon which is engaged a lock washer 27 upon the top of which is engaged a nut 28 which is threaded upon the central electrode and which operates tohold it in position. Also threaded upon the upper. ex

tremity of the central electrode is a binding nut 29 whichprovides means for attachment of the spark plug Wire not shown.

The central feature of the present invention is the provision of a novel firingblock indicated broadly by the numeral 30 and including a block member of suitable size and shape which is located at the lower endof the body 10 and which is formed with intersecting holes 31 which are drilled or otherwise formed therethrough. The central electrode 24 extends down through theupper portion of this block and terminates within the intersection of the holes ,31 as clearly shown. oally opposite points of the reduced lower end 11 of the'body are lugs 32 which are opposite the ends of two of the holes 31, and

secured to these lugs 32 is a transverse member 33 which passes through one of the holes 31 and which is of course spaced from the lowerend of the central electrode 2a whereby to provide the necessary spark gap.

In the operation of the plug it will be seen that the spark occurs between the lower end of the central electrode 24 and the trans- Extending from diametriverse Wire member 33 which passes through the firing block. 111 this Way it Will be seen withstanding severe usage especially in view of the strength of the parts and the 'speeii'ic manner or" connection thereoi with each other 7 While we have shoWnand described the preferred embodiment of the invention, it is of course to be understood that We reserve the ri ht inake'such changes in the form, construction and arrangement of parts as will not depart from the spiritof the invention or the scope of the subjoined claims.

What iscla-imed is:

Lln a spark plug, 'a metallic body, a core of insulating material secured therein, a central electrode extending through the core, a firing block carried by the lower end of the electrode and provided Witha pluralityol intersecting passages and a metallic member treversing the open end of the V s particular but it- Will also be capable of 7 1 metallic body'and passing through one of said passages in spaced relation .to the Walls thereof. r

2. In a spark plug, a metallic body, a core o1 insulating material extending through the wall thereof. 7

In a spark plug including 'a metallic body, a porcelain core secured therein, and.

a central electrode passing through the core and pro-vioedwith securing means, a ground electrode structure consisting of a pair of lugs formed on the open end of the body at diametrically opposite points, a firing block locatedatthe open end of the body and provided with intersecting holesysa-id block being furthermore provided With an opening into which extends the lowerend of the central electrode, and atransverse Wire member passing through said lugs and through one of the holes in the, block in spaced relation tothe free-end of the centralv -.electrode whereby to define acspark gap.

In testimony whereof We :aiiix our signatures.

FRANK SAMLAND. GEORGE SKOW; 

